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x in (-oo:+oo)
x/4.9-(x/6.3) = 15 // - 15
x/4.9-(x/6.3)-15 = 0
x/4.9-0.15873016*x-15 = 0
0.04535147*x-15 = 0 // + 15
0.04535147*x = 15 // : 0.04535147
x = 15/0.04535147
x = 330.75002861
x = 330.75002861
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